工程陶瓷镜面磨削新方法及其机理的研究

Study on New Grinding Techniques of Mirror Surface and Its mechanism for Engineering Ceramics

基于各种磨削参数对氧化铝砂轮磨削氮化硅工程陶瓷材料表面粗糙度影响的试验研究,提出了氧化铝砂轮加工工程陶瓷时的作用过程可分为氧化铝砂粒与工件表面的凸峰碰撞破碎去除,碰撞与摩擦共同作用及摩擦抛光三个阶段,并建立了各阶段的去除模型。而后通过对不同磨削参数的工件加工表面进行微观观察,证明了上述加工机理的存在,并能获得良好的表面质量,达到了镜面加工要求,实现了在普通磨床上对陶瓷材料的高质量加工。

With consideration of the effects of grindingparameters on the surface roughness in grinding, a series oftests by grinding the nitride silicon with the aluminum oxidegrinding wheels are carried out. Based on the results of tests,the material removal is mainly through three stages, namely,stage of collision fracture, stage of collision and burnishing,and stage of burnishing. At the same time, the materialremoval model for each stage is built. With the help ofScanning Electron Microscope (SEM) and Tailor Profile-meter, the finished surfaces of workpiece after grindingunder different grinding parameter are observed whichthereby prove the validity of the material removalmechanism aforementioned. Results from the observationshow that aluminum oxide grinding wheels can be used toobtain the mirror surface when grinding the engineeringceramics and simultaneously high quality machining couldbe achieved by plain grinding machine.